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a in (-oo:+oo)
a/7 = -4/7 // + -4/7
a/7-(-4/7) = 0
a/7+4/7 = 0
1/7*a+4/7 = 0 // - 4/7
1/7*a = -4/7 // : 1/7
a = -4/7/1/7
a = -4
a = -4
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